import machine, dht, time
import network
import urequests

# Connect to Wi-Fi (Wokwi simulation only supports Wokwi-GUEST)
wifi = network.WLAN(network.STA_IF)
wifi.active(True)
wifi.connect("Wokwi-GUEST", "")

# Wait until connected
while not wifi.isconnected():
    print("Reconnecting...")
    time.sleep(1)

print("Connected:", wifi.ifconfig())

# DHT22 temperature and humidity sensor on GPIO4
sensor = dht.DHT22(machine.Pin(4))

# LDR (light sensor) on GPIO34 as ADC input
ldr = machine.ADC(machine.Pin(34))
ldr.atten(machine.ADC.ATTN_11DB)  # Full voltage range 0-3.3V

# LEDs on GPIO 26, 27, 14, 12 as output pins
led1 = machine.Pin(26, machine.Pin.OUT)
led2 = machine.Pin(27, machine.Pin.OUT)
led3 = machine.Pin(14, machine.Pin.OUT)
led4 = machine.Pin(12, machine.Pin.OUT)

# Servo motor on GPIO18 for cooling fan simulation
servo = machine.PWM(machine.Pin(18), freq=50)

# Update this URL each time you restart app.py
FLASK_URL = "http://duplicate-islamist-appraisal.ngrok-free.dev/update"

while True:
    sensor.measure()                    # Read DHT22 sensor
    temp = sensor.temperature()         # Get temperature in °C
    hum = sensor.humidity()             # Get humidity in %
    light_val = ldr.read()              # Get raw ADC value (0-4095)
    light_lux = round((light_val / 4095) * 1000)  # Convert to 0-1000 lux scale
    print("Temp:", temp, "°C  Hum:", hum, "%  Light:", light_lux, "lux")

    # Turn LEDs on when dark (below 450 lux)
    # Note: threshold is 450 because Wokwi LDR has a built-in offset
    # that prevents readings from dropping below ~450 even at minimum illumination
    if light_lux < 450:
        led1.on(); led2.on(); led3.on(); led4.on()   # All LEDs on
    else:
        led1.off(); led2.off(); led3.off(); led4.off()  # All LEDs off

    # Spin servo (simulate cooling fan) when temp is >= 35°C
    if temp >= 35:
        servo.duty(115)  # Fan on (full rotation)
    else:
        servo.duty(40)   # Fan off (rest position)

    # Send sensor data to Flask server
    try:
        response = urequests.post(
            FLASK_URL,
            json={"temperature": temp, "humidity": hum, "light": light_lux},
            headers={"ngrok-skip-browser-warning": "true"}  # Bypass ngrok browser warning
        )
        print("Server response:", response.status_code)
        response.close()  # Free memory after response
    except Exception as e:
        print("Failure to send data:", e)

    time.sleep(2)  # Wait 2 seconds before next reading